diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 07a0fb7..f4ec487 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -8,7 +8,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: 3.x
diff --git a/.github/workflows/run_tests.yml b/.github/workflows/run_tests.yml
index aa353dd..b72970d 100644
--- a/.github/workflows/run_tests.yml
+++ b/.github/workflows/run_tests.yml
@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # per https://github.com/conda-incubator/setup-miniconda#caching-environments
       - name: Setup Mambaforge